Emil weiss and louis fraenkel



(No Model.)

E. WEISS & L. FRAENKEL.

MIDDLINGS PURIPIBR.

No. 383,262. Patented May 22, 1888..

iran rares EMIL wWEISS AND LOUIS ERAENKEL, OF BERLIN, GERMANY.

MIDDLINGS=PURIF|ER.

SPECIFCATIN forming part of Letters Patent No. 383,262, dated May 22, 188g.

Application ledNovembor13, 1886. Serial No. 218,755. (No model.) Patented in Germany April 1, 1886, No. 39,227; in France June 30, 1886, No. 177,115; in England July 26, 1886, No. 9,648; in Belgium October 20, 1886, No, 74,971; in Sweden October 25,1886, Nol886; in Italy December 2l, 1886, XX. 20,773; in Spain .Tanuary20,1887, No. 10,485; inNorway February 9, 1887, No. 262, and in Austria-Hungary March 28, 1887, No. 44,446 and No. 11,183.

T0 all whom, it may concern:

Be it known that we, EMIL Weiss and Louis FRAENKEL, subjects of the King of Prussia, residing at Berlin, in the Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Middlings-Puriiiers, (which have been patented to us in Germany April 1, 1886, No. 36,227', in Belgium October 20, 1886, No. 74,971; in Norway Eebruary 9, 1887, No. 262; in Austria-Hungary March 28, 1887, Nos. 44,446 and 11,183; in Spain January 20, 1887, No. 10,485; in France June 30, 1886, No. 177,115; in Italy December 21, 1886, Vol. XX, No. 20,773; in Sweden October 25, 1886, No. 886, and in England July 2G, 1886, No. 9,618) of which the following is a specification.

This invention relates to middlings-pu riders; and the object of our invention is to provide a new and improved middlings-purier, in which the air above the screen is alternately compressed and released, thereby producing alternate compression and suction, and thus facilitating the separation of the ilour from the granular parts.

' The invention consists inthe construction and combination of parts and details, as will be fully described and set forth hereinafter, and finally be pointed out in the claims.

In the accompanying drawings, Figure 1 is a longitudinal sectional view of our improved middlings-puritier; and Fig. 2 is a crosssectional View of the same on line .c a", Eig. 1.

Similar letters of reference indicate corresponding parts.

The casing A,provided with a suitable frame, has closed sides and ends, closed bottom and top, said side walls being made of canvas, fabric, or wood, but in all cases the casingshould be as nearly air-tight as possible. Two screens, s and e', are held in the rocking screenframe m, the tail end of which is open, and which frame is mounted on springs f, one end of the screen-frame being slightly higher than the other. The meshes of the screen are smallest at the raised end of the frame, and gradually increase in size toward the lower end. The sides and raised end of the screen-frame are closed andthe lower end is open.

i is an inlet-pipe which conveys the material to be purified upon the screen. A blanket or sheet, d, of canvas, muslin, or other suitable material,is fastened to the upper edges of the side pieces of the screen-frame m, and extends transversely over the top of said frame, as shown in Fig. 2, and said blanket or sheet of canvas extends from the tail end ofthe screed frame to within a short distance from the inlet-pipe i.

A sheet, n,of flexible material,is fastened to the underside of the top of the casing adjacent to the inlet-pipe i and extends transversely over the screen-frame, the bottom edge of said sheet n being connected with the upper end of the blanket d, the function of said sheet n being to prevent light material from passing upon the top of the blanket d. Four chutes, IL 7L h2 h3, are provided below the rocking screenframe, the chute h for receiving the liner material being the largest. The chutes 7L and h2 are intermediate in size, and the chute li" the smallest. A reciprocating rod, w, is connected with the screen-frame, and with an eccentric on a shaft provided with a suitable drivingpulley, by means of which the screenframe can be rocked or reeiprocated.

The operation is as follows: Through thel inlet-pipe 'i the material to be screened drops upon the screens. By the reciprocating mo tion of the screen-frame the air in the closed exterior casing is set iu motion-that is, motion is imparted to the air, which is approXimately a reciprocating motion. The result of this is that in the screen-frame the air is alterv natel y compressed and expanded. This compression and expansion of the airis facilitated by providing the yielding blanket er canvas on the sereen-framc, as the same distributes the motion ofthe air in the screen-frame uniformi y throughout the entire space inclosed by said screenframe. This alternate pressure and suction in the screen-frame causes the lighter particles to work up toward the surface of the grain or material on the screen and the heavier particles to descend and pass through the meshes of the screen.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. In a middlingspurifier, the combination,

ICO

with a reciprocating screen-fra1ne open at its tail end, and screens in the frame, of a flexible cover applied to the screen-frame above the screen and approximately parallel with the same, substantially as herein shown and dcscribedn 2. In a middlings-pnriiie1,the combination, with a closed casing,of a reciprocating screenframe open at its tail end, a screen in said Io frame, a ilexible cover applied to the screenframe above the screen and approximately parallel therewith, a supply-pipe and a sheet 

